I'm running Win 7 via Bootcamp only because I have a need to run Outlook for work.

Sorry for the momentary thread hijack, but I was under the distinct impression that Entourage and the trio of Mail/AddressBook/iCal *both* support Outlook / Exchange server email, but even if I'm wrong, MS just said that MS Office for Mac 2011 (which will, of course, come out in Q4 2010) includes OutLook for Mac, replacing Entourage. So you might well be Windows-free before the end of the year!